Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1992-06-08
1993-08-31
Rosenthal, Arnold
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112915, 25112917, F16K 3106
Patent
active
052402274
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetically operated valve.
Electromagnetically operated valves communicating with a pressurized fluid in an oil-filled chamber, for example of a gear housing in a motor vehicle, are known. An electromagnetically operated valve of this type comprises a housing; an armature resiliently retained in an armature chamber of the housing by spring retaining means; an armature operated valve body for control of a pressurized medium movable with clearance in a hole provided in the housing and a spring biasing means urging the armature toward a valve part. The armature chamber contains a damping fluid for damping motions of the armature and is hermetically sealed from the valve part toward which the valve body is urged by a rubber membrane. The housing is also provided with a compensating chamber communicating with the armature chamber and arranged on a side of the housing remote from the armature to compensate for volume changes of the damping fluid.
Such known valves are very often connected via an aperture in the armature chamber, to a pressurized oil filled chamber which houses the valve. In such an arrangement, it can happen that particles of dirt enter into the armature chamber and impair the function of the valve. Attempts have been made to prevent this occurrence by fitting filters or by means of intermediate volumes, but this is costly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved electromagnetically operated valve of the above-described type, which does not have the above-mentioned disadvantage.
These objects and others which will be made more apparent hereinafter are attained in an electromagnetically operated valve communicating with a pressurized fluid in an oil-filled chamber, comprising a housing; an armature resiliently retained in an armature chamber of the housing by spring retaining means, advantageously membrane springs; an armature-operated valve body for control of a pressurized medium movable with clearance in a hole provided in the housing and a spring biasing means, advantageously a compression spring, held in the housing and biasing the armature. The armature chamber contains a damping fluid for damping motions of the armature and the housing is also provided with a first compensating chamber communicating with the armature chamber and arranged in an end of the housing remote from the armature to compensate for a volume change of the damping fluid.
According to the invention, the housing is also provided with a second compensating chamber connected with the first compensating chamber via a duct. The second compensating chamber is filled with air and communicates with the oil-filled chamber filled with the pressurized fluid so that dirt and other particles in the pressurized fluid cannot contaminate the damping fluid of the armature chamber.
In contrast, the valve in accordance with the invention with the characterizing features of the main claim has the advantage that the ingress of dirty oil into the valve, in particular into the armature chamber, is prevented in a simple manner.
In one embodiment of the invention the valve is arranged in an oil-filled engine part in the oil-filled chamber so that air cannot escape from the second compensating chamber, even through it is open to the oil filled chamber. For example, an oil-filled gear housing can contain the oil-filled chamber in which the valve is mounted and can include means for fully flushing an oil in the oil-filled gear housing through the valve housing.
The valve can also include a valve part against which the valve body is urged by action of the spring-biasing means and a rubber membrane in the housing between the armature chamber and the valve part for hermetically sealing the armature chamber from the valve part.
In another embodiment of the invention the electromagnetically operated valve also includes a gauze insert located in an opening between the first compensating chamber and the second compensating chamber
REFERENCES:
patent: 5060695 (1991-10-01), McCabe
Robert & Bosch GmbH
Rosenthal Arnold
Striker Michael J.
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